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Forum Index : Electronics : Mab1's wiseguy inverter build - transformer options
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KeepIS Guru  Joined: 13/10/2014 Location: AustraliaPosts: 1877 |
If everything else is wired correctly then changing the 5V reg to wiseguys modified 5V circuit as you have done should stop that flashing  The only effect of a higher value Precharge resistor is a slower startup time before the capacitor banks are charged equal to the Battery voltage, then the Nano enables the Solenoid and SPWM. _ Edited 2025-07-15 14:01 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| mab1 Senior Member  Joined: 10/02/2015 Location: United KingdomPosts: 245 |
It already has wiseguys 5v regulator, but I think the cycling was to do with the economiser: when it was cycling on and off there were clunks coming from the solenoid. But it now has the keepis arrangement and just displays inv off and the dropping cap voltage until the cap bank has discharged So the inverter box is finished (the transformer lives outside the box, and the post transformer bits will too for now). I've added an extra turn to the primary of the (temporary) transformer, 27 turns, approx 27v. With 26 turns I was getting 76% pwm at min battery volts*, and 62% pwm at max battery volts. But there's no room for another turn even if I need it. *I've ended up with a slightly non standard battery voltage: battery 1 is 15s liion, and battery 2 will be 17s lifepo4, so it's sort of 50v rather than 48v. 15s made more efficient use of the available ev battery modules than 14s |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1877 |
Sounds like everything is running as it should  My 16S LiFePO4 banks sit between 52.4V (loaded) after running overnight and 54V (charging) as I only charge to around 92% to 96% depending on tail time by the end of the day. Really great to see the journey from the start of the build to a fully running Inverter. _ Edited 2025-07-16 16:00 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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wiseguy Guru Joined: 21/06/2018 Location: AustraliaPosts: 1210 |
I moved my comments & description of inverter on/off back to Wiseguys New Inverter Build Nano Rev6 Here Now it doesn't clog MAB1's thread and is probably better placed. Edited 2025-07-18 10:39 by wiseguy If at first you dont succeed, I suggest you avoid sky diving.... Cheers Mike |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1877 |
Thanks for the insight, although I would not call this a "stuff up", especially in light of the enormous amount of work involved for you at the time, bringing this rapidly changing and evolving project together resulting in such a powerful elegant robust design for a truly superb DIY Inverter, including the brilliant code design and programming skills from Poida for his Core Nano SPWM driver. NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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disco4now Guru Joined: 18/12/2014 Location: AustraliaPosts: 1001 |
Will the forward voltage drop on the diode in the circuit for pre-charging the capacitors mean they won't quite get to VBat and need an adjustment in the setup to account for it? Latest F4 Latest H7 FotS |
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| wiseguy Guru Joined: 21/06/2018 Location: AustraliaPosts: 1210 |
Good question, in Poidas code we put a known voltage simultaneously on the Vcap and Vbat inputs and calibrate them both simultaneously to the known Vbat voltage. That way resistor tolerances are taken into account and calibrated for. There would be an offset error that the diode causes to the Vcap that becomes more prominent the closer we get to zero volts. I'm going to ask KeepIS what the prognosis is for the added diode, and when calibrating should it be with the diode included for better accuracy at the region of interest, or does version two need more work.... or more lipstick... Circuits in question:  Edited 2025-07-18 11:46 by wiseguy If at first you dont succeed, I suggest you avoid sky diving.... Cheers Mike |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1877 |
The diode should not cause any issue and if used should be installed when calibrating, VBat to VCap delta is only relevant when the Inverter is above low voltage cutout and SPWM / Solenoid are enabled. My code also has a more stringent delta test immediately after Solenoid enable (and a different code), IMHO in either case, the calibration of VCap with a Diode in series should only have an influence at very low voltages when the Solenoid is switched off, as wiseguy indicated, that difference should be meaningless to the code at low V. EDIT: Just to be clear, there are separate calibration settings for Vbat and VCap in my Code, and allowable Delta is adjustable up to 3V if needed. _ Edited 2025-07-18 15:44 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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